i'montessa brewer back in the saddle covering the big news coast to coast. we begin with breaking news. the judge in the roger clemens perjury trial has just declared a mistrial. nbc's pete williams is in washington, d.c. what's the judge saying about this trial, pete? >> reporter: well, the judge has said he'll decide at a hearing on september 2nd, almost two months from now, where we go from here. this trial had just started yesterday with opening statements from both sides and the prosecutors had begun calling witnesses, but the judge had told the prosecutors in advance that certain evidence was off-limits and one of the things that was off-limits was related to testimony by a friend and former teammate of roger clemens named andy pettitte who had played with him on two major league teams. andy pettitte has said that roger clemens told him he used human growth hormone. clemens says that pettitte is mistaken. what's at issue here is a legal document, sort of sworn statement by the wife of andy pettitte, who says yeah, i heard my husband tell me that roger